Kiyoshi takaeto



K. TAKANO.

SAW.

APPLICATION FILED NOV. 15. 1919.

1 ,85 1 ,499. Patented g- 31, 1920.

v; /0 v 5-13; fifik *uNiTED' J STAT-ES PATENT," OF CE.

mosnr TAKANO, or HONOLULU, mnnnirony or HAWAII.

' 'sAvv.

Application filed November 15, 1919. SeriaINo. 338,221.

' To all whom it may concern:

Be it known that I, KIYosHI TAKANO, a 7

subject of the Emperor of Japan, residing at Honolulu, in the county ofHonolulu and Territory of Hawaii, have invented certain 7 new and usefulImprovements in Saws, of

which the following is a specification, reference being had to theaccompanying drawings.

This inventlon relates to saws and particularly to a saw constructed toeliminate friction.

The disadvantage of the solid surface saw is that in the sawingoperation the continual rubbing of the sides of the saw with thematerial not only generates heat which is injurious to the saw butcauses friction, which greatly interferes with the sawing.

operation. In addition to this, .any lubricant that is applied to thesides of the saw is entirely removed after a few strokes of the sawthrough the material.

It is therefore an object of this invention to provide a saw having apluralityof'shallow grooves, which permit the escape of heat generatedin the sawing operation, and at the same time to eliminate frictionbetween the saw and the material.

Another object is to provide a plurality of grooves in the sawarrangedto retain indefinitely the lubricant applled to the saw and topermit circulation of the lubricant in the grooves.

Another object of the inventlon is to pros vide a saw having a pluralityof grooves in one side arranged in staggered relation to a plurality ofgrooves in the other side, to retain the original strength of the saw.

A still further ob'ect of the invention is to provide a saw having aplurality of grooves'in each side thereof, each groove be- I ingarranged to operate alternately to the adjacent groove 1n the other sldeofthe saw,

to eliminate friction and permit the escape of heat. I

These objects are attained by the mechanism illustrated in theaccompanying drawing, in which- Figure 1 is a side elevation of a sawshow ing the graduation ofthe grooves;

Fig. 2 is a fragmentary longitudinal sectional view of the saw and oneof the grploves, showing the end wall of the groove; an

Fig. 3 is a sectional view on the line 3+3 of Fig. 1.

Referring to the drawings, 5 indicates a saw Specification of LettersPatent. Patented Aug. 31, 1920.

having the conventional handle 6. It'will,

the saw adjacentthe back and ends thereof, I

the ends of the grooves providing resultant inclined end walls 12. Thepurpose of terminating the ends 11 of the grooves before the groovereaches the back or end of the saw 1s to prevent any lubricant appliedto the saw from escaping at the ends of the grooves and at the same timeto prevent Y weakening of the saw structure at its edges.

'To' provide additional strength to the saw, each groove is graduatedaccording to the form or construction of the saw, so that a relativelyequal margin is provided around the edge of the saw.

Grooves 13 of similar construction and purpose are formed in the side 8of the saw, and are positioned in staggered relation to the groove 10 inthe side 7 of the saw, so that one groove 10 is disposed on the oppositeside of the saw between the space separating the grooves 13, and viceversa. This feature not only permits alternating operation. of thegrooves, but does not decrease the strength of the saw. By this novelarrangement, a plurality-of grooves can be formed in the sides of thesaw Without decreasing its strength or weakening it in any manner, and

at the same time they permitthe escape of 1 heat generated by the saw,eliminate friction, retain indefinitely any lubricant applied to the sawand permit the sawing operation to be accomplished with greater ease andrapidity than was possible before.

What is claimed is: 1. A saw having a plurality of grooves in each sidethereof arranged to hold lubricant,

said grooves being of graduating lengths, said grooves being ofgraduating lengths,

the ends of: said grooves terminating adjaeach end portion of the bottomof each 10 cent the edges of the saw. groove inclining upwardlylongitudinally of 2. A, saw having a plurality of grooves, the grooveand terminating at the face of said grooves being of graduating lengths,the saw. each end portion of the bottom of each In testimony whereof Ihereunto aflix my groove merging with the faceof the saw. signature.

3. A saw having a plurality of grooves, KIYOSHI TAKANO.

